Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a4a9c0bede0559…

MALICIOUS

PDF

71.3 KB Created: 2021-02-27 04:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: a48cb507d0bd2a51b1672be663a4ec1a SHA-1: fa913f25d5438bf82c80df53e2d9d19ded9a32ad SHA-256: f6a4a9c0bede055984c30543ef45701664c6aaf7d9664c264340a53182884df5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one that appears to be a link farm hosted on disposable domains, suggesting an attempt to redirect users to potentially harmful content. The PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/123?utm_term=2006+honda+civic+oil+filter+wrench+size PDF link annotation
    • http://milky-rp.space/history_channel_vault_subscription5fq5p.pdfIn PDF document text
    • https://denagivar.weebly.com/uploads/1/3/1/3/131383646/penetufironusatu.pdfIn PDF document text
    • http://gojepifega.22web.org/10695607904.pdfIn PDF document text
    • http://summerita.fun/tololepamapuluvamurozomev4kzo.pdfIn PDF document text
    • https://kiwakamumosa.weebly.com/uploads/1/3/5/9/135963193/lilawa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488316/normal_5fecf3a841ac4.pdfIn PDF document text
    • http://futup.ru/mudras_to_help_you_sleepkq5tn.pdfIn PDF document text
    • https://mowasedexalobir.weebly.com/uploads/1/3/4/7/134743102/tuvovow.pdfIn PDF document text
    • https://luzatewuxajexi.weebly.com/uploads/1/3/4/2/134265782/semofejadozejetiv.pdfIn PDF document text
    • http://gasufulezexe.22web.org/django_humanize_template.pdfIn PDF document text
    • http://hookup754.fun/115887120622aq8j.pdfIn PDF document text
    • https://kosemarenile.weebly.com/uploads/1/3/4/3/134315061/165ea1de6ca552.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lanubili/sikove.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/52946569124.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 5644 bytes
SHA-256: 54e4cc2b46365529c2995bef28a6a16ffc23614a3d2a9e63ebbc82579811eca7
font_01_sfnt_off0000ec5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5F 10484 bytes
SHA-256: a2baaddd2cc838cb20a382d19ba58800c6e90f99d083ae00285dcf33f64d2a3d

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